Actually, I don't recall that Fab was ever low sudsing until 1990 or so when it became an ultra concentrated powder, along with Wisk power scoop, ultra Tide, Oxydol and Cheer. Fab became a lemon scented product sometime around 1970 or so. So it became Fab with Lemon Freshened Borax and "active enzymes". Then after there were issues with enzymes (workers in the manufacturing facilities began having skin and respiratory irritation issues), it became Fab with lemon freshened borax and "all fabric brighteners". All the manufacturers removed enzymes from their products. Then all the phosphate nonsense started in 1972-1973 and the rest is history.
Fab added the fabric softener in the mid to late 80's and also introduced their liquid version as well as "Fab One Shot" - the pouches that you added to the wash and supposedly contained detergent and Fabric Softener - you left them in through the entire wash and then they went through the dryer if I recall correctly. They were notable only for the excessive amount of packaging they required and didn't either clean or soften that well at all.
Regarding scents, the original Fab scent was lovely - very fresh and slightly sweet/floral, but clean. Several other Colgate detergent scents were based off that in different strengths. Super Suds, Colgate's long time bargain product had a weaker version of that scent. Burst, their 1969 offering that was concentrated like Dash and All, had the exact same fragrance as original Fab. And AD seemed to have a very mild version of that scent.
To the comment about All's fragrance, while it wasn't intrusive, I never cared much for it either - much preferred Dash's scent. but that also changed in 1969 or so when enzymes were added. The new fragrance became very much like original Biz pre soak. Of course later on in the very early 80;s, Dash became a budget detergent also lemon scented and no longer concentrated.
Ah, the good old days